2 Power Options: DC power + Battery (4000mAh Backup) Built in 4000mAh large rechargeable battery instead of running on disposable batteries, which means money-saving, environmentally friendly, and hassle-free. This pet fountain supports cordless use after charge, and corded use by plugging in(5V/1A Adapter not include). These 2 options give you non-limitation locations where to position the fountain(indoor and outdoor). 3 Modes: MOTION SENSOR 1 + TIMER SENSOR 2 + STANDARD MODEOur cat water fountain offers 3 mode options for different needs. SENSOR 1 start when pet approaches and stop when pet leaves. SENSOR 2 is the default mode, when pets approach, it will auto feed for 30s, and then stay inactive for 8 mins despite pets are around, such that unneeded sensor work can be avoided. STANDARD MODE is constant flow, this mode works only when plugged in, which saves battery power and can last longer. 3.2L/108oz Water Purification SystemThis 3.2L water fountain for cats and dogs lasts longer than you travel per fill. The use of high-end coconut shell activated carbon filter ensures the strongest filterability of catching everything(hair, heavy metals, even the invisible), and drinking safety to your fur babies as the PP cotton layer and charcoal are all food grade. Plus, the stainless steel top is more hygienic, more durable and easier to clean(dish-washer safe) than a plastic top. Filter Replacement ReminderThe filter replacement indicator will turn on when filter reaches to the life span to remind you of a change timely so as to avoid the filter being overused, which is the main cause to the growth of harmful substance in the water, faulty filtering and illness to a cat. The low power indicator will turn on red when low battery level to remind you to plug it in for working and charging at the same time, not have you wait for it to charge. LONG-LASTING Pump: Quiet, Low Power, Auto Shut-off The true silence below 38db is the reason cats trust it and drink from it and cat parents can sleep soundly in harmony with it. The 0.3W ultra-low power and 5V low voltage saves big on electricity bill, works way safe, and outlasts all other brand on account of an superior motor, auto shut-off feature when lacking water and inbuilt pump filter to save the pump from blockage and damage. Excellent Customer Support Any questions please feel free to contact us on , a satisfiing solution will be given. Warm reminder, for your furbaby's drinking health, please buy the correct quality-assured filter set.